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What Is The Protection Mode Of A Solar Charge Controller?
- Aug 31, 2018 -

Protection mode


1. Direct charge protection point voltage: direct charge is also called rapid charge, belongs to fast charge, generally in the battery voltage is low when the battery charged with high current and relative high voltage, but there is a control point, also known as protection point, is the value in the table above, when the battery voltage is higher than these protection values, should be charged. Stop direct charging. Direct charge protection point voltage is also generally "overcharge protection point" voltage, when charging the battery terminal voltage can not be higher than this protection point, otherwise it will cause overcharge, it is harmful to the battery.


2. Equilibrium Control Point Voltage: After direct charging, the battery will generally be charged and discharged by the controller for a period of time, so that its voltage will fall naturally, when it falls to the "recovery voltage" value, it will enter the state of uniform charge. Why design uniform charge? When the direct charge is completed, there may be individual battery "backward" (terminal voltage is relatively low), in order to pull these individual molecules back, so that all the battery terminal voltage uniformity, so it is necessary to high voltage with a moderate current and then charge for a short time, so-called uniform charge, that is, "balanced charge" Electricity. The average charge time should not be too long, usually a few minutes to more than ten minutes. Too long time is harmful. For a small system equipped with a two piece battery, it does not mean much. Therefore, street lamp controllers usually do not have equal charge, only two stages.


3. Floating Charge Control Point Voltage: Generally, after charging, the battery is also stationary for a period of time, so that its terminal voltage will fall naturally, when it falls to the "maintenance voltage" point, it will enter the floating charge state, similar to "trickle current charging" (i.e. small current charging), the battery voltage is charged on a low point, a low point on the charge, One by one, so as not to keep the battery temperature rising, which is good for the battery, because the internal temperature of the battery has a great impact on charge and discharge. In fact, PWM mode is mainly designed to stabilize the terminal voltage of the battery, by adjusting the pulse width to reduce the battery charging current. This is a very scientific charging management system. Specifically, it is necessary to reduce the charging current to prevent excessive gas release (oxygen, hydrogen and acid) from overcharging when the residual capacitance (SOC) of the battery is more than 80% at the later stage of charging.


4. Over discharge protection termination voltage: This is quite understandable. Battery discharge can not be lower than this value, which is the GB requirement. Battery manufacturers have their own protection parameters (enterprise standard or line standard), but ultimately to the national standard close. It should be noted that, for the sake of safety, the overdischarge protection point voltage of 12V battery is generally added 0.3V as temperature compensation or zero drift correction of control circuit, so that the overdischarge protection point voltage of 12V battery is: 11.10v, then the overdischarge protection point voltage of 24V system is 22.20V.


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